It was not the intention of the authors to ignore important and relevant published theoretical and field-based work, especially work the basic premise of which converges with that of the experimental observations. That basic premise is that regionally extensive erosional unconformities (sequence boundaries) by the nature of their formation are (to varying degrees) diachronous, composite surfaces. This point is clearly made by Holbrook based on extensive and detailed field work on the Dakota Sandstone and substantiated in our experimental work. These data sets together, as Holbrook has suggested, reinforce one another. The experimental observations suggest that, indeed, fluvial sedimentary processes...

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